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I have been a member of 名媛直播 Empire for a year and appreciate all of the information presented on your lectures by your masters!
But, I am having an issue with a Shohin Corkbark Black Pine that I purchased in Massachusetts in February 2023, and have been growing it in Naples, Florida since. I have been working on it with a bonsai master.
Since it had not been decandled in 3 years, we proceeded with decandling in July. It has been fertilized with Biogold fertilizer, and kept in full sun, southern exposure. It did have some signs of needlecast over the summer for which I treated it with Daconil.
However, over the past few weeks, it has developed significant browning of the needles and has begun to look weak.
We pulled it from the pot. There was some Mychorrizae seen, but not a lot, and it was not root bound.
I have applied Great White Mychorrizae to increase growth, and placed the tree under high led lighting to prevent sunburn.
I would appreciate any further insight and advice you may have on care to enhance the health of my tree.
I thank you in advance!
Tom

Do you know that black pines are temperate trees that needs to be outdoors at all times?

Tropfrog wrote:

Do you know that black pines are temperate trees that needs to be outdoors at all times?

In Fort Myers it probably won't get the cold weather it needs to go dormant. Being outside won't matter much since air conditioning probably keeps indoors cooler than outdoors.

Then it will not survive long anyway, but even quicker inside. Not really a suitable species for the climate

That was my initial thought as well. Maybe the area just don't get enought cool days to keep it healthy? But my knowledge about USA local climates is very weak.

Anyway, if it is kept indoors it will definetely die. If outdoors it may struggle, but will live longer than indoors. Air conditioners dries up the air even more than heating do. Keeping any plants long term healthy in heavy chilled livingroom conditions is hard.

Interesting thoughts, it has been outdoors since I acquired it, and there are seven pine species native to Florida. In fact, Ed Trout has been very successful with pines in
Ft. Lauderdale, which is the same climate as here.
Having said that, climate could be the issue as I can’t find anything wrong with the care of the tree. I will send it to my bonsai brother in the Northeast to see if we can save it.
Thank you all for your input

Hmm. I just asumed this was about japanese black pine. Pinus thunbergii. Are there any other black pine that can develop cork bark?

Why are you using led light if it is outdoors?

Indeed, it is Pinus thunbergii. Next time, I’ll stick to the Pinus subspecies native to Florida. Just unfortunate that there are bonsai professionals willing to sell such a nice, old bonsai to someone in the wrong climate, knowing it will die, just for money.
And, I am in agreement that it is currently in an improper climate. It’s heading to NY this week, as I do not want it to die.
I currently have it on my outdoor lanai, aka porch up North, and under LED as I had sunburn as a possible issue, which I now know is not the problem.

I doubt your climate is the problem. Japanese Black Pines can grow in tropical countries, with people in the caribean being known to grow them succesfully for decades. So other things might be amiss, which I would guess could be fungal and/or overwatering.

Interesting that you ask this here, rather than discuss it with the master you work with at home and/or the nursery where you got the tree. What did they suggest?